Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c1afdce50aa7fc…

MALICIOUS

PDF

97.2 KB Created: 2021-06-28 07:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 32fcb8ef1c8f90ea2478995344ce6e93 SHA-1: aaa5efd2d0053cf68855fcdf33afdb6aa4574698 SHA-256: 31c1afdce50aa7fcead91a999eb30e0257d158ca181b6fdab32c3c7d0ebc9a08
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links to potentially compromised websites and exhibits characteristics of a link farm. Crucially, the 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's content is designed to solicit sensitive recovery information from the user, such as private keys or backup codes. No scripts were extracted, but the PDF structure itself likely facilitates the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://statewideroadservices.com/clients/879378/File/zojogagorutakexozuw.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4e194fe7---tepino.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ho8dd8g0b2b31972c15cka6u97/wevijosusigu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160810cef2bd84---gobozadulojiva.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ec773025---mupefagilija.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/23324901651.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/265230c5b7717ea9a81d0129701b2af1/muxebonedurugikugep.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67ce6669d---28031114631.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/13f6dd3ffedacfd67de34863b1114d2d/fixasomigesi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2ec45fd8---gipowefoxunatorokenofexon.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/8bc7e7a3e1dfc4b3d5d18ed809720d40/belerebebat.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dajuxobawaxufepeze.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/tusifopetezajiweveni.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8695f4031---vitokoferovefu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/dolaturonuwazi.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mavad.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/a3bee36d82fe7fba2ee0ecfae3321088/rawajowini.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/51562875679.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/81445987780.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/66095681883.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12dc067869---sugutupunapor.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e65036b92---15468325130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=text+detection+in+images+pythonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 10996 bytes
SHA-256: e7defffea50b67b1a1772a2b3613fc3f66a288883cd97b870ef1edccc18dd650
font_01_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 18344 bytes
SHA-256: a3aa9f5d307c9cc1b2c9cce016048a74c5f9782c4a6f2b710658eb4c654339f7

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